Observed arrival · 2026-10-28
A breach checker that keeps the match on your device
A Japanese database of publicly reported data breaches lets people check services against its records, including through their Gmail registration history.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Japanese users checking whether services they use reported data breaches
- Worth noticing
- The ledger lists 258 structured cases and 1,004 headlines; Gmail matching reads sender and subject terms, not message bodies.
Field notes
The Gmail workflow starts with a Takeout export containing only mail; users wait for the export, then read it from Drive without downloading it. The site says the match uses sender and subject terms on the user's device. Its response score covers six criteria, and the homepage says items not described in source materials receive zero points.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue